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<html>
<head>
<style>
body {
margin: 0px;
}
#child {
width:100px;
height:100px;
background-color: green;
display: inline-block;
}
#parent::before {
content: '';
width: 100px;
height: 100px;
display: inline-block;
background-color: blue;
}
</style>
</head>
<body>
<div id="parent">
<div id="child"></div>
</div>
</body>
</html>